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The NetLog is now an internal detail of the network service.
And this CL: https://chromium-review.googlesource.com/c/chromium/src/+/1695293
still left dead codes about NetLog. The CL removes it for code health.

Bug: 963875
Change-Id: I01c246b95a961b219bb4c93fd4b40743f9ba5e20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2192536
Auto-Submit: Jinsong Fan <jinsong.van@gmail.com>
Commit-Queue: Tobias Sargeant <tobiasjs@chromium.org>
Reviewed-by: Tobias Sargeant <tobiasjs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770992}